GLS Class (X166) Produced from 2016 to 2019

Completely DOA

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Old May 23, 2025 | 02:05 PM
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From: Danville, CA
GLS450
Completely DOA

We have a 2017 GLS with 115k miles. Last night my wife told me that her key wouldn't work, I figured maybe her key battery was shot.

Today I go to start the vehicle and it is completely DOA. Never seen anything like this before. No power to accessories or to engine, seats won't move, door locks won't work. Nothing.

Anybody seen this before? Seems worse than just. a dead battery, and we had both replaced in the past two years.

Will try to jump start later but not optimistic, prob need a tow.
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Old May 29, 2025 | 10:10 AM
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Hopefully just something ledt on.
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Old May 29, 2025 | 12:31 PM
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Just to update - if this happens to you and the vehicle cannot shift into Neutral, you need to request a special tow from Mercedes when they jack your car onto dollies in order to avoid damaging the tires and 4WD. The AAA truck was unable to provide this service.
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Old May 29, 2025 | 09:16 PM
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That's odd, because I'm pretty sure the auxiliary battery is supposed to prevent that. So, AAA was unable to jump it?
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Old May 30, 2025 | 08:13 PM
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Bad news, extensive water damage, probably from a blockage in the roof gutter that eventually leaked to floor under both front seats. $1 grand to tear it apart and potentially $11k to repair. This will be a total unless insurance will cover it.

Sorry guys but this may be my last post. I used to say the GLS was the best vehicle I ever owned but once it hit 100k the repairs were frequent and expensive.

There doesn't seem to be a Goodbye forum like the Welcome forum, so Hasta la vista!

Last edited by Boraxo; May 30, 2025 at 10:43 PM.
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Old May 31, 2025 | 10:26 AM
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Boraxo, just curious... was your truck kept in a garage? Was it parked under pine trees? Was this a 'drive-to-work' and park outside vehicle?
The new Lexus GX and LX series look promising 🤷‍♂️ Sayonara!
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Old Jun 1, 2025 | 07:56 AM
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Originally Posted by clarkpittman
Boraxo, just curious... was your truck kept in a garage? Was it parked under pine trees? Was this a 'drive-to-work' and park outside vehicle?
That said, there's no excuse for a design that mixes water and electronics under the carpeting or is so delicate that it can't be parked outside. I guess I better dump mine while they are still running. And, as someone who has driven trucks, it's certainly not a truck! In fact, pickup trucks barely qualify.
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Old Jun 1, 2025 | 10:30 AM
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Originally Posted by John CC
That said, there's no excuse for a design that mixes water and electronics under the carpeting or is so delicate that it can't be parked outside. I guess I better dump mine while they are still running. And, as someone who has driven trucks, it's certainly not a truck! In fact, pickup trucks barely qualify.
Did I miss it but was it not the clogged sunroof drains? If so, keep them clean.
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Old Jun 2, 2025 | 07:32 AM
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How do sunroof drains get clogged, besides parking under trees year after year, or if leaving the sunroof open for extended (days, nights) periods?
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Old Jun 2, 2025 | 07:55 AM
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1.) - your car does NOT NEED a "Special Mercedes Tow". It needs a qualified tow truck driver.
2.) - did you try jumper cables?
3.) - yes, our car (GLS) has died, dead dead. In every instance it was parked for extended periods in a windy environment (an issue we have gone over again and again with the ride systems).
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